A Lesson in Perfection: 1959 Ariel Square Four

Restorer Gary Athey found the Ariel Square Four he’d always wanted, and then rebuilt it to his own specification.

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by Jeff Barger

Engine: 997cc air-cooled OHV “square” 4-cylinder, 65mm x 75mm bore and stroke, 7.2:1 compression ratio, 42hp @ 5,500rpm (claimed)

Top speed: 105mph (approx.)

Carburetion: SU, variable choke

Transmission: 4-speed, chain final drive

Electrics: 6v, coil and breaker points distributor ignition

Motorcycle Classics Magazine
Motorcycle Classics Magazine
Motorcycle Classics Magazine Featuring the most brilliant, unusual and popular motorcycles ever made!